摘要
针对钛白废酸的资源化 ,采用陶瓷膜微滤澄清钛白废酸 ,为进一步扩散渗析回收硫酸提供预处理。研究了操作条件如压力、流速、质量浓度、温度等对过程的影响。研究表明陶瓷膜过滤钛白废酸具有很好的澄清效果 ,渗透液浊度小于 0 .5NTU ;废酸中较高质量浓度的硫酸亚铁使温度对过滤的影响复杂化 ,温度降低会使其在膜孔内发生结晶 ,产生难以恢复的堵塞 ;采用 5mg/kg以下的改性聚丙烯酰胺絮凝可以使膜通量有所提高 ,过多的絮凝剂会使膜产生吸附污染而降低通量。
Aim at the resource of titanium white waste acid, clarification of waste acid by ceramic microfiltration membrane was studied. The influences of operation parameters such as transmembrane pressure, crossflow velocity, concentration and temperature on filtration process were investigated. The results show that hydrate titanium dioxide in waste acid can be successfully recovered by ceramic membrane microfiltration and an excellent clarification effect is achieved. The turbidity of clarified waste acid is less than 0.5 NTU. The high concentration of FeSO 4 in waste acid complicate the effect of temperature on filtration process. When the temperature decrease less than 293 K, crystallization of FeSO 4 may occur in membrane pores. The membrane flux is decreased to a very low level, and it is difficult to regenerate the membrane. Flocculation by modified polyacrylamide, with concentration less than 5 mg/kg, will somewhat increased the membrane flux. Adding overmuch flocculants may cause adsorption fouling of membrane and result in decrease of flux. The membrane flux is also affected by other parameters. The technology is reliable for the pretreatment of the waste acid before the diffusion dialysis.
出处
《化学工程》
EI
CAS
CSCD
北大核心
2003年第5期58-61,65,5-6,共7页
Chemical Engineering(China)
